Экологические особенности внутривидовой конкуренции особей туи западной (Thuja occidentalis l.) в аллеях с простым и сложным ритмами посадки
2013
Кучерявый, В. (National Forestry University of Ukraine, Lviv, Ukraine)
The purpose of our investigation was focused on the processes of spatial and morphological differentiationof white cedarin two row plantations: 1) simple pattern “Fastigiata – Fastigiata” and 2) complex pattern “Fastigiata- Globosa – Fastigiata”. The ecological peculiarities of the columnar white cedar “Fastigiata – Fastigiata” werestudied in a 25-year-old street plantation, as well as in an alley plantation. The competition between the individuals of“Fastigiata - Fastigiata” led to their morphological differentiation. In the course of growth, when the crowns beginto touch each other, the trees start to severely compete for light, and because of its lack, some trees are stunted and die.Great death rates were observed among trees in the street plantation on highly compacted soil that is usually characteriziedby a poor aeration and moisture content. In the alley plantation “Fastigiata - Globosa – Fastigiata” (planted in the60s), after 50 years the configuration of the row changed because of the morphological differentiation of trees and asa result of their competition for light. The proportion of “cone - globe” elements changed. The extension of the crownsof globular thuja beyond the designed row led to such a negative phenomenon as gravity. In order to enhance thedecorativeness of green walls formed of the columnar thuja “Fastigiata”, dead and stunted plants should besystematically removed. Also, to prevent the growing out of globular thuja trees “Globosa”, they must be regularlypruned and brought to the sizes required by plantation design.
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